Predict sentiment of input text

[ibrahimsharaf]

The script now only supports training and testing given an input dataset, we need to add a new function to support prediction given a new example.

• Save the trained models (doc2vec, random forest/logisitc regression)
• Load them when the user wants to predict the sentiment of a specific input text.

Depends on #14

[avinashsai]

@ibrahimsharaf I can take up this. Please review my PR so that we can proceed further.

[avinashsai]

@ibrahimsharaf what should be done in the next step??

[ibrahimsharaf]

@avinashsai a PR including the first two issues in this previous PR (#6)?

[avinashsai]

Sure, i will open another PR with the first two.

[luciferldy]

已收到，谢谢